Sapphire crystal generally refers to synthetic sapphire, which is quite different from the natural sapphire that people usually understand, and is generally used to make watches and mirrors.

Sapphire glass is made of fine alumina powder, which is formed into sapphire crystal blocks in a furnace with a certain high temperature of Celsius, and then made through countless processes. Its hardness is second only to diamond, equivalent to 7 times that of steel. Sapphire glass ≠ Natural sapphire.

Sapphire is the general name of corundum gemstones with other colors except ruby, and its main component is alumina (Al2O3). Blue sapphire is caused by a small amount of titanium (Ti) and iron (Fe) impurities. Sapphire can be pink, yellow, green, white, or even multiple colors in the same stone.

Sapphire is produced in Changle, Thailand, Sri Lanka, Madagascar, Laos and Cambodia, among which the rarest sapphire belongs to Kashmir, and Myanmar is the best place to produce sapphire at present.

Sapphire is characterized by uneven color, and parallel hexagonal columns are arranged with flat bands and growth lines of different shades. Poly-sheet has the development of bimorph, and the bimorph pattern of louver is common. Cleavage often cleaves along double crystal planes. Dichroism is strong. In addition to the above characteristics, sapphires all over the world have their own characteristics due to different places of origin. In 1980s, many sapphire deposits were discovered in basalt along the eastern coast of China.

A blue star gem weighing 65,438+0,404.49 carats was found in Sri Lanka, with a value of at least $6,543.8+0 billion.

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China glass. How does com identify sapphire glass on a watch?